<template>
  <div>
    <li :style='{background: bgColor}' @mouseenter="selected(true)" @mouseleave="selected(false)">
      <label>
        <input type="checkbox" v-model="todo.completed"/>
        <span>{{ todo.title }}</span>
      </label>
      <button class="btn btn-danger" v-show="isShow" @click="deleteItem">删除</button>
    </li>
  </div>
</template>

<script>
import PubSub from 'pubsub-js'

export default {
  name: "TodoItem",
  props: {
    todo: Object,
    index: Number,
    // deleteTodo: Function,
  },
  data() {
    return {
      bgColor: 'white',
      isShow: false
    }
  },
  methods: {
    selected(isSelect) {
      if (isSelect) {
        this.bgColor = '#cccccc'
        this.isShow = true
      } else {
        this.bgColor = '#ffffff'
        this.isShow = false
      }
    },
    deleteItem() {
      // this.deleteTodo(this.index)
      // 采用发布消息的方式
      PubSub.publish('deleteTodo', this.index)
    }
  }
}
</script>

<style scoped>

/*item*/
li {
  list-style: none;
  height: 36px;
  line-height: 36px;
  padding: 0 5px;
  border-bottom: 1px solid #ddd;
}

li label {
  float: left;
  cursor: pointer;
}

li label li input {
  vertical-align: middle;
  margin-right: 6px;
  position: relative;
  top: -1px;
}

li button {
  float: right;
  /*display: none;*/
  margin-top: 3px;
}

li:before {
  content: initial;
}

li:last-child {
  border-bottom: none;
}
</style>
